zona pellucida

noun (1)
zo·​na pel·​lu·​ci·​da | \ ˌzō-nə-pə-ˈlü-sə-də How to pronounce zona pellucida (audio) , -pel-ˈyü-\
plural zonae pellucidae\ ˌzō-​(ˌ)nē-​pə-​ˈlü-​sə-​(ˌ)dē How to pronounce zonae pellucidae (audio) , ˌzō-​ˌnī-​pə-​ˈlü-​sə-​ˌdī , -​pel-​ˈyü-​ \

Definition of zona pellucida

 (Entry 1 of 2)

: the transparent more or less elastic noncellular outer layer or envelope of a mammalian ovum that is composed of glycoproteins

zona radiata

noun (2)
zona ra·​di·​a·​ta | \ -ˌrādēˈätə, -ˈātə\
plural zonae radiatae\ -​ˈätˌē , -​ˈātˌē , -​tˌī \

Definition of zona radiata (Entry 2 of 2)

: zona pellucida especially : one having unusually distinct striations

First Known Use of zona pellucida

Noun (1)

1841, in the meaning defined above

History and Etymology for zona pellucida

Noun (1)

New Latin, transparent zone

Noun (2)

New Latin, radiate zone

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The first known use of zona pellucida was in 1841

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More Definitions for zona pellucida

zona pellucida

zona pel·​lu·​ci·​da | \ -pə-ˈlü-sə-də How to pronounce zona pellucida (audio) \

Medical Definition of zona pellucida

: the transparent more or less elastic noncellular glycoprotein outer layer or envelope of a mammalian ovum often traversed by numerous radiating striae

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